[Clayart] Vertical pugmills

[Robert Harris]

When I saw the post about the vertical roller, I had many of the same
thoughts that Vince called out. It also seems to me that transferring a
soft slab onto a horizontal surface without distortion is a very dicey
prospect!

On the other hand, one of the things I've always thought about is vertical
pumills. Pugmills really do take up a lot of space horizontally that could
be saved by mounting them vertically.
 I've seen quite a few really old ones in youtube videos of potters like
Richard Batterham and maybe some of the old NC potters, but with the
exception of a really high end semi-industrial one, they don't seem to make
them for the solo potter.

I can imagine there are some issues with hopper loading, but since almost
all extruders are vertically mounted I can't see any fundamental reason why
they wouldn't work.

Vince (and anyone else) if you were going to redesign Harry Davis' pugmill
to operate vertically, how would you do it?

Also has anyone ever made a pugmill barrel out of plastic lined concrete
(for all the people that complain about porcelain corroding steel) or is
that mostly a tolerances problem? (I was imagining surrounding a high PSI
PVC tube with concrete). What gap/tolerance is needed between the blades
and the barrel in order that clay is pushed all the way through?

Rob
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